Method for processing clad material



Feb. 5, 1946. R. K NS 2,394,383

METHOD FOR PROCESSING GLAD MATERIAL NNNNNN OR Kobertff Hop/11125 I Z a/nw ATTORNEY Patented Feb. 5, 1946 METHOD FOR PROCESSING cLAn MATLRIAL 7 Robert K. Hopkins, New YorlnN. Y., assignor to The M. W. Kellogg Company, New at corporation oi Delaware 2, 1e43, Serial No. 498,388

Application August 1 1 Claim.

The present invention relates to a method L processing clad metal material to produce thereon an edge having a coating of protective metal.

If a body of armored orclad metal is cut, a raw edge results along which all of the com- I ponent zones of the body are bared. Sincethe base zone consists of metal having comparatively low resistance to corrosion, oxidation, wear or. other destructive action, the exposed base metal along said edge must be armored with protective metal if the body is to withstandthe intended service satisfactorily.

One object of the present invention is to provide a comparatively simple and expeditious method by which-clad material may be cut and. anfedge produced that is coveredby a coating of protective metal integrally bonded to the different component zones of the material.

Another object is to provide a comparatively simple and expeditious method by which clad material may be cut and an edge produced that is covered throughout its area by a coating of metal integrally bonded to the different .component zones of the material and having an analysis substantially the same as that of an outer protective zone of said material.

York, N. Y.,

steel or any of the other ferrous or non-ferrous metals commonly employed in the manufacture of vessels, containers and the like. The facing zones i2 may be of any ferrous or non-ferrous Afurther object is to provide a method of pre- Q paring a clad material so that upon the cutting of a hole therein, the marginal edge thereof will have a coating of protective metal covering substantially its entire area.

Narious other objects, features and advantages of the inventionwill be apparent from the following particular description, and from an inspection of the accompanying drawing, in which Fig. 1 is a section of a conventional body of clad or armored material prior to being processed in accordance with the method of the present invention;

Fig. 2 showsthe sectionof the clad body of Fig. 1 after it has been conditioned in accordance with the method of the ,present invention, but before it has been cut; and

Fig. 3 shows the section of the clad body of Fig. 2, but after it has been cut. 1

The method of the present invention is applied to a coated metal' article shown in the drawing as a conventional body ID of clad or armored material, having a single or double coating. Bo dy l0 may be a sheet, plate, slab, and ingot, etc. In

the specific form shown, the compositebody ID has a base zone II, and is doubly coated by two face zones l2 integrally bonded to said base zone throughout their common extent. The base zone ll may, for example, be carbon steel, low alloy i'netal or alloy, such as chrome steel, chromenickel steel, manganese steel, Monel metal and the like, having corrosion, oxidation, wear or other resisting property superior to that of the base zone II for the intended purpose. a

The composite body ID as shown in Fig. 1 is intended to be cut, for example, for perforation circularly along the lines 0-11 and bb indicating the diametrical'opposed margins of the intended'line of cut. To prepare the body ill in accordance with the method of the present invention for cutting, there is produced in the body In along its intended line of cut a vein 13 of weld metal as'shown in Fig. Zintegrally bonded to the component zones l i and I2 of the body, and affording the desired protective coating for the base zone II when said body is out along said line of out. To impart to the weld IS the required protective property, this weld desirably. has an analysis which is the same substantially as that of the face zones l2. However, as far as certain aspects of the invention are concerned, this weld I3 may have an analysis different from that of the face zones l2 as long as it has the required protective or resisting properties.

In a case where a hole is to be cut out of the clad body 10, the weld H is produced in said sheet as a closed endless vein or partition. In the specific form of the invention shown, this weld I3 is in the form of a circular ring extending circumf erentially along the intended cutting line of the hole with said cutting line located substantially centrally with respect to the radial thickness of said ring. as shown in F1832.

The weld I3 is autogenously produced in the body III by any suitable welding process while said body is in one piece. For example, it may be produced by arc, welding through the use of a bare or coated electrode having the desired composition, so that when the-metal of said electrode is fused and mixed withythe fused metal of the clad body ill, the resulting metal will have substantially the desired analysis. This welding operation may be carried out without preliminary weld grooving of the body Hi, and is controlled to produce a weld i3 having the desired analysis, thickness and depth. When body Ill is or excessive thickness it may be necessary to provide a. groove for the deposition of weld metal IS. The heat of the welding operation fuses not only the metal or the electrode or other metal which might be employed, but also the section of the body It) along the intended cutting line, and causes thorough and rapid diffusion of the metal ingredients inthe fused mixture, so that 1 the resulting weld I3 will be of sound uniform .composition and will be integrally and inseparably bonded to the component zones II and I2 of the body ill to the full depth of said body.

After the compositebody in has been processed as described and shown in FZig. 2 to provide the weld I3 along its intended cutting line, the weld overlays i4 projecting beyond the surfaces of said sheet may be removed. This removal of the weld overlays M is desirably effected by grinding the weld l3 flush with the surfaces of the composite sheet it). As far as certain aspects of the invention are concerned, this weld overlay [4 maybe removed by any other suitable means, as for ex-' ample, by chipping.

After the clad body ID has been processed as described so fan-a circular hole I5 is sheared or otherwise incisively cut from said body along the lines a-a and b-bas shown in 'Fig. 3. This cutting of the hole l5 may berefiected by punching, jmachining, shearing, trepanning, etc. The resulting hole IE will have a marginal edge 16 protectivelycovered by the outer circumferential portion ll of the weld l3. This edge coating I! will form with the outer facing zones l2 a continuous integral protective covering for the base zone ll throughout the entire'exposed surfaces of the clad body III, including those exposed by perforation of said sheet. Although this edge coating I? may be of any suitable analysis to afford the desired protection to the base zone i i, as far as certain aspects of the invention are concerned it is desirably of stainless steeLand has a composition similarto that of the facing zones l2. When zones l2 are of different composition coating i! will usually be made of the same analysis as the preferred one of the zones.

Althoughthe invention is shown applied to the fabrication of a clad body having a hole protectively covered at its marginal edge. as .far as certain aspects of the invention are concerned, the

. invention can be applied to the fabrication of a clad body having any kind of an edge, straight or otherwise, covered with a coating of protective I metal. The operation of producing a vein of weld metal along the intended line of severance of a clad body. for the purpose described is a much simpler and more expeditious method than welding the protective metal coating to' the exposed edge of the body after severance of said body. Furthermore, by the process of the present invention, acut edge will be produced which is smooth and substantially finished. On the other hand, the welding of a protective metal coating to the exposed edge of the body after severance of said body will produce a rough irregular edge, which will have to be machined or otherwise finished.-

As many changes can be made in the above method, and many apparently widely different embodiments of this invention can be made without departing from the scope of the claim, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limitin sense.

I claim: A process of producing article whose cross-section throughout is made up of base metal unitedto at least a covering zone of protective metal, which comprises fusing a strip of said articlealong the line of the desired edge and simultaneously depositing metallic a severed edge definedentirely by protective metal in a composite metal 

